[board] Add neighbor and piece modules

Add a Direction enum in the neighbor module
Add Color and PieceShape enums, and a Piece struct to the piece module

board/src/lib.rs

@@ -1,3 +1,5 @@
 mod bitboard;
+mod neighbor;
+mod piece;
 mod position;
 mod square;

board/src/neighbor.rs

@@ -0,0 +1,12 @@
+// Eryn Wells <eryn@erynwells.me>
+
+pub enum Direction {
+    North,
+    NorthWest,
+    West,
+    SouthWest,
+    South,
+    SouthEast,
+    East,
+    NorthEast,
+}

board/src/piece.rs

@@ -0,0 +1,34 @@
+// Eryn Wells <eryn@erynwells.me>
+
+#[derive(Debug, Eq, PartialEq)]
+pub enum Color {
+    White,
+    Black,
+}
+
+#[derive(Debug, Eq, PartialEq)]
+pub enum PieceShape {
+    Pawn,
+    Knight,
+    Bishop,
+    Rook,
+    Queen,
+    King,
+}
+
+#[derive(Debug, Eq, PartialEq)]
+pub enum PiecePlacementError {
+    PieceExistsOnSquare,
+}
+
+#[derive(Debug, Eq, PartialEq)]
+pub struct Piece {
+    pub color: Color,
+    pub piece: PieceShape,
+}
+
+impl Piece {
+    pub fn new(color: Color, piece: PieceShape) -> Piece {
+        Piece { color, piece }
+    }
+}